MADE AT MARIETTA, OHIO. 



25 



DiAGKAM G. — Marietta, Ohio. 



-I — r 



7 8 910111213141516171819 2021 

 February. 





Diagram H.- 



-Brunswick 



, Me. 



29° 





1 1 1 1 1 



27 



- 





/- 



25 

 23 

 21 



--../-\_ 





A/ : 



19 



1 1 1 1 1 1 



1 1 1 1 



1 1 1 1 1 



7 8 9 101112131415161718192021 

 February. 



The Marietta curve exhibits a remarkable depression of temperature about 

 February 17th, amounting to about 4°. This may possibly be part of the pheno- 

 menon noticed in Europe about February 12th. It is, however, not supported by 

 the Brunswick observations, which indicate but a slight depression about the 12th 

 and 19th. 



The mean daily temperatures from March 8th to March 25th, from 32 years of 

 observation at Marietta, and from 51 years of observation at Brunswick are as 

 follows ; — 





Marietta. 



Brnnswick. 





Marietta. 



Brunswick 



8 . 



. 41°.6 



29°.7 



Marcli 17 . 



. 41°.8 



35°.6 



9 . 



. 41.4 



31.8 



« 18 . 



. 40.8 



33.5 



10 . 



. 41.3 



31.8 



« 19 . 



. 40.1 



33.5 



11 . 



. 41.8 



31.8 



" 20 . 



. 44.2 



35.1 



12 . 



. 43.3 



31.8 



" 21 . 



. 42.8 



33.7 



13 . 



. 42.7 



34.0 



" 22 . 



. 41.9 



32.2 



14 . 



. 41.5 



32.3 



" 23 . 



. 43.5 



35.7 



15 . 



. 40.8 



32.3 



" 24 . . 



. 45.0 



37.0 



16 . 



. 41.4 



33.1 



" 25 . 



. 44.7 



35.2 





Diagram I. — Marietta, Ohio. 



46° 

 44 

 42 

 40 





July, 1867. 



8 9 10111213141516171819202122232425 

 March. 



